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Page 1 of 4

THV/FEP blends and laminates for low emission fuel hoses

In the automotive fuel hose market there is a need to develop a new lower permeation fuel barrier to meet increased global customer demands for lower or zero emissions. Increased use of alcohol based fuels such as CE10 also demand better permeation resistance. One approach has been to use Dyneon™ THV laminated to NBR (Fig. 1). While bonding performance with THV and NBR is satisfactory, the permeation resistance needs to be improved to meet newer more stringent emission regulations. FEP has excellent permeation resistance to automotive fuel, but negligible bondability to other fuel hose materials without an etching step. Etching steps are often unacceptable.

A unique approach is to use a blend of THV and FEP to improve permeation resistance and yet maintain acceptable bondability to other polymers such as ECO, HNBR, NBR and FKM. Dyneon™ THV 815/FEP 6307 blends give great permeation resistance to CE10, almost as low as FEP (Fig. 2).

NBR

THV

Fig. 1 Hose Construction

12

10.53

·day)

10

2

Permeation constant (g·mm/m

8

6

4

2.68

2

0.62

0.50

0.46

0

THV 500 THV 815 FEP 6307/ THV 815 (70/30)

FEP 6307/ THV 815 (80/20)

FEP 6307

Fig. 2. Permeation Constants CE10 at 60oC

1/4

Page 2 of 4

The following examples will demonstrate and explain improved adhesion between FEP/ THV blend and NBR by adding DBU or FX 5166 to the NBR compound.

10 cm by 10 cm sheets of compounded NBR 1 mm thick were applied onto about 200 µm thick sheets of THV 815 or FEP/ THV815 blends. Then the laminated sheet as shown in Fig. 3 was heated under pressure on a press at 160°C for 20 minutes to evaluate the adhesion between the NBR and THV 815 or FEP/ THV815 blends. A 15.2 cm by 15.2 cm shim stock with 0.75 mm thickness was used to maintain the thickness of the laminate under the heat press. The sample was removed from the press and allowed to cool to room temperature. Thre...